Lamellar structure formation of hot-stamped galvannealed coating during tempering

Akihiro Sengoku, Hiroshi Takebayashi, Norihiko Okamoto, Haruyuki Inui

研究成果: Conference contribution

抄録

A significant amount of research and development on partial softening techniques, including tempering, is being conducted. Coated steel sheets, including galvannealed (GA) steel sheets, have been applied to automobile components. It is thought that tempering has a great influence on the coating structure in heating treatment after the hot-stamping process. In this study, a change of hot-stamped GA coating during tempering was investigated. By analyzing hot-stamped GA coating tempered at different temperatures, it was elucidated that the coating structure of hot-stamped GA may change during tempering. Tempering at more than 500°C separates the Fe-Zn solid solution, which is the hot-stamped GA coating, into two phases, a r phase and an Fe-Zn solid solution, which contain less Zn than the original. This coating structure change results in lamellar structure formation. Lamellar structure formation is thought to be caused by discontinuous precipitation from the Fe-Zn supersaturated solid solution. The main factor of generating lamellar structure formation is the diffusion velocity of Fe and Zn, determined by the tempering temperature. In addition, the driving force of the phase separation has an effect on this reaction.

本文言語English
ホスト出版物のタイトル6th International Conference Hot Steel Metal Forming of High-Performance Steel, CHS2 2017- Proceedings
編集者Mats Oldenburg, Braham Prakash, Kurt Steinhoff
出版社Association for Iron and Steel Technology, AISTECH
ページ121-129
ページ数9
ISBN(電子版)9781935117667
出版ステータスPublished - 2017 1 1
外部発表はい
イベント6th International Conference on Hot Steel Metal Forming of High-Performance Steel, CHS2 2017 - Atlanta, United States
継続期間: 2017 6 42017 6 7

出版物シリーズ

名前6th International Conference Hot Steel Metal Forming of High-Performance Steel, CHS2 2017- Proceedings

Other

Other6th International Conference on Hot Steel Metal Forming of High-Performance Steel, CHS2 2017
CountryUnited States
CityAtlanta
Period17/6/417/6/7

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Metals and Alloys

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